If you're one of the countless Americans who was distraught to learn of the revelations made by former National Security Agency (NSA) contractor Edward Snowden, the mere idea that there might be yet another agency out there - perhaps just as powerful and much more intrusive -  should give you goosebumps.

Foreign Policy reports that the National Geospatial-Intelligence Agency, or NGA, is an obscure spy agency former President Barack Obama had a hard time wrapping his mind around back in 2009. But as the president grew fond of drone warfare, finding a way to launch wars without having to go through Congress for the proper authorization, the NGA also became more relevant. Now, President Donald Trump is expected to further explore the multibillion-dollar surveillance network.

Like the Central Intelligence Agency (CIA) and the National Security Agency (NSA), the NGA is an intelligence agency, but it also serves as a combat support institution that functions under the U.S. Department of Defense (DOD).

With headquarters bigger than the CIA's, the building cost $1.4 billion to be completed in 2011. In 2016, the NGA bought an extra 99 acres in St. Louis, building additional structures that cost taxpayers an extra $1.75 billion.